First Strike is a Star Wars Total Conversion for Battlefield 2142 which replaces all content, down to rocks and other scenery, with new material. It currently features 5 maps, 2 factions (Empire and Rebels), and a handful of vehicles. It also introduces space combat, which is boring at first but really gets fun once you know what you're doing and not just flying about shooting random X-Wings. It's also a bit thin on the ground vehicle-wise, with only three infantry-only maps so far - the AT-ST is the only combat vehicle. I'm sure this'll change soon enough, though.

The problem with FS is that since it's a mod, there's no way to download a demo for it or anything. You have to pay up for BF 2142 and then download FS, and if you don't like it, you've wasted your money.

I personally felt it was money well spent, though. I've played some hours of FS and not a single second of Vanilla BF 2142. Nor do I plan to play Vanilla any time soon.

"I'm not even angry. I'm being so sincere right now,
Even though you broke my heart and killed me.
And tore me to pieces...
And threw every piece into a fire.
As I burned, it hurt because
I was so happy for you." - GLaDOS